Base adapter



FIG. 1 is a top perspective view of our new base adapter;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view of thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for base adapter, as shown and described. 